linux-kernel - Re: [PATCH v2 7/8] ARM: perf: Allow the use of the PMUv3 driver on 32bit ARM

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Message-ID: <864jrrytzn.wl-maz@kernel.org>
Date:   Sun, 12 Feb 2023 11:59:40 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Zaid Al-Bassam <zalbassam@...gle.com>
Cc:     Jesus Sanchez-Palencia <jesussanp@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v2 7/8] ARM: perf: Allow the use of the PMUv3 driver on 32bit ARM

On Fri, 10 Feb 2023 16:54:59 +0000,
Zaid Al-Bassam <zalbassam@...gle.com> wrote:
> 
> From: Marc Zyngier <marc.zyngier@....com>
> 
> The only thing stopping the PMUv3 driver from compiling on 32bit
> is the lack of defined system registers names and the handful of
> required helpers.
> 
> This is easily solved by providing the sysreg accessors and updating
> the Kconfig entry.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> Co-developed-by: Zaid Al-Bassam <zalbassam@...gle.com>
> Signed-off-by: Zaid Al-Bassam <zalbassam@...gle.com>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Link: https://lore.kernel.org/r/20230126204444.2204061-8-zalbassam@google.com
> ---
>  arch/arm/include/asm/arm_pmuv3.h | 259 +++++++++++++++++++++++++++++++
>  drivers/perf/Kconfig             |   5 +-
>  drivers/perf/arm_pmuv3.c         |   5 +-
>  3 files changed, 265 insertions(+), 4 deletions(-)
>  create mode 100644 arch/arm/include/asm/arm_pmuv3.h
> 
> diff --git a/arch/arm/include/asm/arm_pmuv3.h b/arch/arm/include/asm/arm_pmuv3.h
> new file mode 100644
> index 0000000000000..b2d9dc9dedbac
> --- /dev/null
> +++ b/arch/arm/include/asm/arm_pmuv3.h
> @@ -0,0 +1,259 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2012 ARM Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */

Same remark here.

	M.

-- 
Without deviation from the norm, progress is not possible.